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"""Filter the small catalog first; downloads require --download and a byte budget."""
from __future__ import annotations

import argparse
import json
from concurrent.futures import ThreadPoolExecutor
from pathlib import Path

from hesrt_io import RELEASE_TAG, download_sample, load_catalog


def main() -> None:
    parser = argparse.ArgumentParser(description=__doc__)
    for field in ["organism", "technology", "gse", "gsm", "tissue", "disease"]:
        parser.add_argument("--" + field)
    parser.add_argument("--limit", type=int)
    parser.add_argument("--download", action="store_true")
    parser.add_argument("--max-gb", type=float, default=2.0)
    parser.add_argument("--workers", type=int, default=4)
    parser.add_argument("--revision", default=RELEASE_TAG)
    parser.add_argument("--output", type=Path, default=Path("hesrt_subset"))
    parser.add_argument("--cache-dir")
    args = parser.parse_args()
    if not 1 <= args.workers <= 8 or args.max_gb <= 0 or (args.limit is not None and args.limit < 1):
        parser.error("Use 1-8 workers, a positive byte budget and a positive limit")
    frame, revision = load_catalog(args.revision, args.cache_dir)
    for argument, field in [("organism", "organism"), ("technology", "technology"), ("gse", "gse_id"), ("gsm", "gsm_id")]:
        value = getattr(args, argument)
        if value:
            frame = frame.loc[frame[field].eq(value)]
    for field in ["tissue", "disease"]:
        value = getattr(args, field)
        if value:
            frame = frame.loc[frame[field].str.contains(value, case=False, regex=False, na=False)]
    frame = frame.sort_values(["archive_bytes", "gsm_id"])
    if args.limit is not None:
        frame = frame.head(args.limit)
    args.output.mkdir(parents=True, exist_ok=True)
    frame.to_csv(args.output / "selection.csv", index=False)
    summary = {"revision": revision, "samples": len(frame), "studies": int(frame.gse_id.nunique()),
               "compressed_gb": float(frame.archive_bytes.sum()) / 1e9,
               "uncompressed_gb": float(frame.uncompressed_bytes.sum()) / 1e9,
               "mode": "download" if args.download else "dry_run"}
    (args.output / "selection.json").write_text(json.dumps(summary, indent=2) + "\n")
    print(json.dumps(summary, indent=2), flush=True)
    if not len(frame):
        parser.error("No matching samples; inspect available labels in the catalog")
    if not args.download:
        print("No sample packages downloaded. Add --download after reviewing selection.csv.")
        return
    if summary["compressed_gb"] > args.max_gb:
        parser.error("Selection exceeds --max-gb; narrow it or explicitly raise the budget")
    def fetch(row: dict) -> str:
        return str(download_sample(row, args.output, revision, args.cache_dir))
    with ThreadPoolExecutor(max_workers=args.workers) as pool:
        for folder in pool.map(fetch, frame.to_dict("records")):
            print(folder, flush=True)


if __name__ == "__main__":
    main()